John,
I've used Evapo-rust on spot locations on a frame. For example with rusted top tube brake cable guides, I take Q-Tips soaked in Evapo-rust and put them in the guides for a day or so. I usually have to re-dip them several time. I cover them up with thin plastic sheets to help keep the Evapo-rust wet.
I've done the same with cotton or gauze dipped in the stuff for larger spots.
I use a stainless dental tool and gently scrape away any excess rust buildup.
CR member Don Gillies Dipped portions of his frame in Evapo-rust, here's the link:
http://www.ece.ubc.ca/
Chas. Colerich Oakland, CA USA
> I considered naval jelly (phosphoric acid) and oxalic acid. But I was looking for something that has a relatively neutral pH that carries little risk for harming the surrounding paint. I'd also like something that is in a gel form so it can be applied to a frame.
>
> The only non-acidic rust remover I am aware of is EvapoRust, which is only available as a liquid. Mixing it with corn starch should form a nice thick paste that can be applied to parts that can't be dipped. I don't know yet if it is adequate to remove rust.
>
> Otherwise I'll try the Rust Release gel. It's $26 for a half gallon, but that should be a lifetime supply for me.
>
> ...Unless anyone has another non-acid rust removal idea.
>
> John Ferguson
> New York, NY